import math

print(abs(-1))

print(max(1, 3, 6, -1))

print(int('123'))

print(int(15.69))


def circle_area(r):
    'calculates the area of a circle.'
    return math.pi * r * r


print("%.2f" % (circle_area(9)))

print(type(circle_area(1)))

'''
1
6
123
15
254.47
<class 'float'>
'''


# 匿名函数
def build(x, y):
    return lambda: x * x + y * y


token = input("please in put your token:")
print(token)
print(build(3, 6))
